Which DTH provider is offering the cheapest base package? (I hardly watch more than 3-4 channels. So, with the cheap base package, I can subscribe to those selective channels separately.)

The best option for you is to opt for Dish TV Connection with Non-Stop Offer.

All you have to do is pay Rs. 2490 and you get new Dish TV HD Connection with 3 years subscription of My 99 Pack containing around 160+ channels. In case, you need more channels, you can subscribe to those channels for Rs. 10 per channel per month.

Visit Dish TV Free to Air Set Top Box with Unlimited Recording Facility for details.